990547 has 2 divisors, whose sum is σ = 990548. Its totient is φ = 990546.

The previous prime is 990529. The next prime is 990559. The reversal of 990547 is 745099.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990547 is a prime.

It is not a weakly prime, because it can be changed into another prime (991547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495273 + 495274.

It is an arithmetic number, because the mean of its divisors is an integer number (495274).

2⁹⁹⁰⁵⁴⁷ is an apocalyptic number.

990547 is a deficient number, since it is larger than the sum of its proper divisors (1).

990547 is an equidigital number, since it uses as much as digits as its factorization.

990547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 990547 is about 995.2622769903. The cubic root of 990547 is about 99.6839018725.

The spelling of 990547 in words is "nine hundred ninety thousand, five hundred forty-seven".